Accrued Expenses and Other Current Liabilities (Product Warranty Rollforward) (Details) - USD ($)	6 Months Ended
	Jan. 31, 2023	Jan. 31, 2022
Changes in Product Warranty Liability
Balance at beginning of period	$ 9,420,000	$ 17,600,000
Provision for warranty obligations	555,000	587,000
Adjustments for changes in estimates	(1,500,000)	(2,500,000)
Charges incurred	(922,000)	(1,956,000)
Balance at end of period	$ 7,553,000	$ 13,731,000